Me : Thank you, that's very kind.
X : But it's also obvious. I can't believe I wasn't doing this before.
Me : Good things are often obvious in hindsight.
X : How did you come up with it?
Me : A mix of luck, hard work, trial and error.
X : What about intelligence?
Me : Neither here nor there. A requisite amount is needed for the task at hand but that's often not a lot.
Me : You can't steal what I give away. As another general rule, when you find something that seems really useful that's when the hard work starts. It takes a long time to get people to try something different ...